From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jeff Wu Subject: Questions about ceph OSD Date: Tue, 2 Nov 2010 14:49:58 +0800 Message-ID: <1288680598.2366.253.camel@osd1> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: Received: from [210.22.136.227] ([210.22.136.227]:60632 "EHLO MAIL.TNSOFT.COM.CN" rhost-flags-FAIL-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1752933Ab0KBGtw (ORCPT ); Tue, 2 Nov 2010 02:49:52 -0400 Sender: ceph-devel-owner@vger.kernel.org List-ID: To: sage@newdream.net, ceph-devel@vger.kernel.org Hi , I have recently been working the preliminary research whether ceph=20 can use at our cloud computing storage system in the future , ceph is a very very excellent file system.But ,Now ,i hit a very important problem for us: Normally, as ceph described , all of the data are saved at OSDs with CRUSHMAP at ceph system. but my goal is to : 1. add a ext3 disk to ceph system ,but doesn't set it as a OSD; 2. save the normal data at the OSDs of a ceph system; 3. save the special data to a local ext3 disk at a ceph system, the ext3 disk is not set as a ceph OSD,but its infos are added to=20 MDS and MON,when Write the special data at a ceph client ,these special data are not saved to ceph server OSDs ,but saved at the local ext3 disk. like this: At ceph client: $ mount.ceph 1.2.3.4:6789:/ /ceph $ cd /ceph $ ls cloud user secret =20 when do writing,"cloud and user" folder data are saved to ceph OSDs , but "secret" folder data are saved to a local ext3 disk . My question is: Q1- If i add a new OSD to the ceph system ,but i do a special CRUSH placement map . Could this ways solved this problem ?,If can ,How ? Q2 - If to implement this function as a patch myself, Could you give me any ideas ? or what parts of ceph codes(server/client) that i need look into ?=20 Thanks for all help and reply . Jeff.Wu Transoft.inc ,Sr.software engineer. =E3=80=80=E3=80=80 -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" i= n the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html